Portable transmitter for radio headphones



FIG. 1 is a top view of a portable transmitter for radio headphones showing my new design;

FIG. 2 is a perspective top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a another side view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear view thereof. 

The ornamental design for a portable transmitter for radio headphones, as shown and described. 